The 4D Business Kit is a stand-alone, double-clickable e-Commerce application built using 4D 6.7.3. The source code for this product is not available to the public. It would be easy to assume, then, that 4DBK is something of a "closed" product. Nothing could be farther from the truth. 4DBK is wide open to any 4D Developer, thanks to the 4DBK IP Component.
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